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Influence of Rheumatoid Factor Levels and TNF Inhibitor Structure on Secondary Nonresponse in Rheumatoid Arthritis Patients

Abstract

Background: The EXXELERATE study revealed poorer clinical outcomes in patients treated with adalimumab (ADL) and baseline rheumatoid factor (RF) above 203 IU/mL. However, responses were similar in patients treated with certolizumab pegol (CZP) regardless of RF levels.

Objectives: This study investigated the impact of RF levels >203 IU/mL on TNF inhibitors (TNFi) serum levels and the association with secondary nonresponse in RA patients treated with TNFi.

Methods: We performed an observational ambispective study with RA patients treated with infliximab (IFX), ADL, or CZP. Patients were stratified according to baseline RF levels: ≤ or >203 IU/mL. After 6 months, serum drug levels and antidrug antibodies were measured, and reasons for discontinuation were collected.

Results: We included 170 RA patients: 90 (53%) received IFX, 48 (28%) ADL, and 32 (19%) CZP. While CZP serum levels did not differ between RF groups at 6 months ( = 0.6), RF levels >203 IU/mL were linked to lower serum drug levels in patients treated with IFX ( = 0.09) or ADL ( = 0.02). Secondary nonresponse was 3.6 times higher in patients with high versus low RF levels in patients under IFX or ADL. However, the reasons for withdrawal were not affected by RF levels in patients treated with CZP.

Conclusion: Baseline RF above 203 IU/mL is associated with lower serum drug levels and an increased risk of discontinuation due to secondary nonresponse in patients treated with IFX or ADL. In contrast, drug levels and clinical outcomes are not significantly impacted by baseline RF levels in patients under CZP.

References
1.
Tanaka Y . Recent progress in treatments of rheumatoid arthritis: an overview of developments in biologics and small molecules, and remaining unmet needs. Rheumatology (Oxford). 2021; 60(Suppl 6):vi12-vi20. PMC: 8709568. DOI: 10.1093/rheumatology/keab609. View

2.
Berkhout L, Vogelzang E, Hart M, Loeff F, Dijk L, Derksen N . The effect of certolizumab drug concentration and anti-drug antibodies on TNF neutralisation. Clin Exp Rheumatol. 2019; 38(2):306-313. View

3.
Machold K, Stamm T, Nell V, Pflugbeil S, Aletaha D, Steiner G . Very recent onset rheumatoid arthritis: clinical and serological patient characteristics associated with radiographic progression over the first years of disease. Rheumatology (Oxford). 2006; 46(2):342-9. DOI: 10.1093/rheumatology/kel237. View

4.
Bird P, Hall S, Nash P, Connell C, Kwok K, Witcombe D . Treatment outcomes in patients with seropositive versus seronegative rheumatoid arthritis in Phase III randomised clinical trials of tofacitinib. RMD Open. 2019; 5(1):e000742. PMC: 6397430. DOI: 10.1136/rmdopen-2018-000742. View

5.
Salgado E, Maneiro J, Carmona L, Gomez-Reino J . Safety profile of protein kinase inhibitors in rheumatoid arthritis: systematic review and meta-analysis. Ann Rheum Dis. 2013; 73(5):871-82. DOI: 10.1136/annrheumdis-2012-203116. View